My Mac's are 1 3/4 into a custum 3" X-pipe with ultraflo mufflers.
The only problem I have with the headers is that they did not fit around my lakewood bellhousing. I had to do some grinding and bending to get them to fit.
If I want to do a simple clutch change I have to pull the headers off. To get the headers out I have to jack up the motor 
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79 Hatch: NA 347, Stage 2 Canfield Heads, Victor JR. Intake, Blueprinted Holley 750 HP, Solid Roller Cam, Shooting for 10's on motor
93 LX: Tremec, dual friction clutch, fms flywheel, Hedman shorties, O/R H-pipe
Ricer hater's club member #49
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